Brows M-1438 Rev B Temporary Service Brows (002).docx

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M-1438 B

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M-1438 B

1. PURPOSE

1.1. THIS DRAWING WAS PRODUCED TO SUPPORT THE MANUFACTURE OF A TEMPORARY SERVICE BROW TO

PROVIDE A MORE ERGONOMIC AND SAFER

ENVIRONMENT FOR TEMPORARY SERVICE WORKERS.

2. GENERAL

2.1. DIMENSIONS UP TO AND INCLUDING 72” ARE SHOWN IN INCHES. DIMENSIONS OVER 72” ARE SHOWN IN FEET (‘), INCHES (“). COMMON FRACTIONS ARE UTILIZED UNLESS OTHERWISE SPECIFIED.

2.2. DIMENSIONAL TOLERANCES SHALL BE:

· 1/16” UP TO 12” INCLUSIVE

· 1/8” OVER 12” UP TO 72” INCLUSIVE

· ¼” OVER 72”

· ¼ DEGREE ANGULAR

· 1/32” FOR HOLES

2.3. DEVIATION OF STRUCTURAL MEMBERS FROM

STRAIGHTNESS GREATER THAN ¼” IN 60”, OR ½” IN LENGTH OF BROW, SHALL BE CAUSE FOR REJECTION.

2.4. WHERE MIL-SPECS, STANDARDS, PROCESS

INSTRUCTIONS, DRAWINGS ARE NOTED ON THIS

DRAWING, THE LATEST REVISION SHALL BE IN EFFECT UNLESS ADHERENCE TO A DEFINITE REVISION IS NECESSARY AND SPECIFIED.

2.5. COPIES OF THIS DRAWING ARE AVAILABLE IN PDF FORMAT FROM C/380.2 INTRANET SITE.

2.6. PIECE BUBBLES ARE DENOTED BY THE PIECE NUMER IN THE TOP HALF WITH THE QUANTITY DENOTED IN BOTTOM HALF.

2.7. PART DIMENSIONS SHOWN IN MATERIALS LIST ARE

APPROXIMATE AND ARE FOR MATERIAL

PROCUREMENT AND ESTIMATING PURPOSES ONLY.

3. DESIGN

3.1. END CAPS MADE FROM PC 66 SHALL BE SEAL WELDED ONTO THE ENDS OF THE LOWER CHORD OF THE TRUSS.

3.2. SERVICE TREE HANGERS, PC 12, SHALL BE SEALED USING PC 55 WITH A SEAL WELD.

4. SAFETY

4.1. BREAK ALL EXPOSED SHARP EDGES AND CORNERS TO 1/16” MIN RADIUS.

4.2. ALL BURRS AND OTHER POTENTIALLY HARMFUL

LEFTOVERS FROM THE MANUFACTURING PROCESS SHALL BE REMOVED TO PREVENT INJURY.

4.3. CARE SHALL BE TAKEN TO REMOVE ALL DEBRIS BUILDUP (FROM EVENTS SUCH AS BLASTING) AND

ELEMENTAL BUILDUP (SUCH AS SNOW) DURING USE.

4.4. TEMPORARY SERVICE BROW SHALL ALWAYS BE SECURED VIA PC 5 WHEN IN USE. CARE SHALL BE TAKEN TO ENSURE THAT THE LASHING LINES ARE NOT TOUCHING ANY OTHER MEMBER ON THE BROW.

5. DESIGN LOADS

5.1. TEMPORARY SERVICE TUNNEL LOAD LIMIT IS 60 POUNDS PER LINEAR FOOT PER SIDE (120 POUNDS PER LINEAR FOOT OVERALL).

5.2. TEMPORARY SERVICE HANGER LOAD LIMIT IS 20 POUNDS PER LINEAR FOOT PER SIDE.

5.3. TEMPORARY SERVICE SIDE TRAY LOAD LIMIT IS 20 POUNDS PER LINEAR FOOT PER SIDE.

5.4. WALKING DECK LOAD LIMIT IS 100 PSF.

5.5. ALL LOADS SHALL BE EVENLY SPREAD OUT OVER THE BROW TO ENSURE THE WEIGHT REMAINS UNIFORM.

5.6. SNOW SHALL NOT BE PERMITTED TO ACCUMULATE ON THE BROW.

6. WELDING AND NDT REQUIREMENTS

6.1. UNLESS OTHERWISE STATED ALL STRUCTURAL JOINTS SHALL BE WELDED TO A MINIMUM SIZE OF 3/16” FILLET/BEVEL WELD.

6.2. WELD FILLER SHALL BE 5356 ON ALL JOINTS.

6.3. SPLICE JOINTS WITH BACKING STRIPS MAY BE ADDED TO FACILITATE FABRICATION AND ASSEMBLY.

6.4. WHEN SPLICING PCS, SPLICE JOINT SHALL BE AT THE CENTER OF THE TRUSS JOINT AS SHOWN ON SHT 7 IN

THE ELEVATION VIEW. CONTRACTOR SHALL PICK

THE JOINT LOCATION ON THE STRUCTURE FOR THE

SPLICING THAT BEST COINCIDES WITH THEIR MATERIAL LENGTH. SPLICES SHALL BE KEPT TO A MINIMUM.

6.5. ALL WELD TOLERANCES SHALL BE -0”, +1/16”.

6.6. MANUFACTURED BY PSNS:

· ALL WELDING OF STRUCTURAL ALUMINUM SHALL BE IN ACCORDANCE WITH (IAW) WITH PSNS WELD PROCEDURE WP-NN-FAC.

GENERAL NOTES

· NON-DESTRUCTIVE TESTING (NDT) TO BE PERFORMED ON ALL ROOT AND FINAL WELDS SHALL BE VT.

· WELDERS SHALL BE ALUMINUM WELDING CERTIFIED.

· FOLLOWING THE TEST DETAILED IN GENERAL NOTE 13, ALL WELDS SHALL BE 5XVT INSPECTED.

6.7. MANUFACTURED BY CONTRACTOR:

· ALL WELDING SHALL BE IAW AWS D1.2.

· ALL WELDS SHALL BE VT PRIOR AND POST TO TESTING PER GENERAL NOTE 13.

· INSPECTION REPORTS SHALL BE PROVIDED AS PART OF END PACKAGE TO PSNS.

7. WIRE MESH REQUIREMENTS

7.1. WIRE MESH, PC 64, SHALL BE MODIFIED AROUND THE LIFTING POINTS TO HAVE A 12” RADIUS QUARTER CIRCLE CUT OUT TO ACCOMMODATE THE LIFTING POINTS.

7.2. MFR SHALL ENSURE THE EDGES OF THE WIRE MESH HAVE A GUARD MADE FROM ALUMINUM PLACED ON THEM TO PROTECT WORKERS FROM INJURY.

7.3. MESH GUARD SHALL BE AFFIXED TO THE INSIDE OF THE TEMPORARY SERVICE BROW ON BOTH SIDES OF THE BROW.

7.4. MESH GUARD FROM GEN NOTE 7.2 SHALL BE USED

TO ATTACH THE MESH ASSEMBLY TO THE

STRUCTURE VIA 3/16” FILLET WELDING TO THE TRUSS AT APPROXIMATELY THE JOINTS, MINIMUM 2” LONG AT EACH CORNER.

8. SIDE TRAY DETAILS

8.1. PC 44, HALF ROUND BAR, SHALL BE BENT AND FITTED

FLUSH TO EACH END OF THE SIDE TRAY ASSEMBLY (FOUR SPOTS IN TOTAL) TO PREVENT A SHARP EDGE TO PROTECT CABLES. SHOWN ON SHT 24.

8.2. PC 44 SHALL BE BUTT WELDED TO PC 11 AND GROUND SMOOTH.

9. WALKWAY REQUIREMENTS

9.1. PC 32 SHALL BE INSTALLED PER MFR’S INSTRUCTIONS.

10. XPS-60 SHORE JACK ASSEMBLY REQUIREMENTS

10.1. PC 36 (ROUND TUBE) SHALL HAVE 2 HOLES DRILLED AND THREADED SUCH THAT PART 37 (XPS-60 SHORE

JACK) CAN BE MOUNTED AS PER MFR’S REQUIREMENTS AND SPECIFICATIONS.

11. LIFTING POINT REQUIREMENTS

11.1. PC 59 SHALL HAVE A SMOOTH AND GRADUAL

TRANSITIONAL RADIUS APPLIED TO BOTH SIDES INTO PC 60 TO AVOID ANY PRESSURE POINTS ON THE RIGGING GEAR.

11.2. PC 59 SHALL BE ROLLED SUCH THAT IT CAN BE MOUNTED FLUSH WITH THE UPPER TRUSS CHORD AND THE VERTICAL TRUSS BRACE WHILE MEETING THE DIMENSIONS ON SHEET 15.

11.3. SIDE GUSSETS SHALL BE COPED TO MOUNT FLUSH TO THE UPPER TRUSS CHORD AND PC 59.

11.4. SIDE GUSSETS SHALL ALSO HAVE A 45 DEGREE COPE

TO CLEAR THE WELD BETWEEN VERTICAL TRUSS BRACE AND THE UPPER TRUSS CHORD. SIZE SHALL BE KEPT TO A MINIMUM.

11.5. DRAIN HOLE SHALL BE INSTALLED AT THE BASE OF THE LIFTING POINTS.

11.6. LIFTING POINTS SHALL BE AT THE FOLLOWING LOCATIONS:

· 30’-45’: ONE VERTICAL TRUSS BRACE FROM END

· 50’-60’: TWO VERTICAL TRUSS BRACES FROM END

· 65’-70’: THREE VERTICAL TRUSS BRACES FROM

END (AS SHOWN ON SHT 15)

12. LIFTING REQUIREMENTS

12.1. MINIMUM WORKING LOAD FOR SYNTHETIC SLINGS SHALL BE AS FOLLOWS:

· 40’ BROW: 14,000 LBS

· 50’ BROW: 16,000 LBS

· 70’ BROW: 20,000 LBS

12.2. 60 DEGREE ANGLE MINIMUM FROM THE HORIZONTAL SHALL BE MAINTAINED AFTER RIGGING GEAR IS FULLY INSTALLED.

12.3. SLINGS SHALL BE INSTALLED AT LABELED LIFT

POINTS WITH CARE TAKEN TO ENSURE THE SLING IS

NOT RESTING ON A SHARP EDGE AND PROPERLY SECURED TO PUT LIFTING STRESSES INTO THE LIFTING POINT.

12.4. LIFTING OF TEMP SERVICE BROW WITH SIDE TRAYS

AND SERVICE TREES IS PERMITTED. THERE SHALL

BE A PRE-INSPECTION BEFORE THE LIFT TO ENSURE ALL NUTS AND BOLTS ARE PROPERLY INSTALLED.

· RIGGERS SHALL ENSURE THAT NO RIGGING GEAR COMES INTO CONTACT WITH SERVICE TRAYS AND SERVICE TREES DURING THE LIFT.

· BROW MAY BE FULLY LOADED WITH TEMPORARY

SERVICE EQUIPMENT PER C/740’S

REQUIREMENTS FOR SECURE LOADS.

13. TESTING REQUIREMENTS

13.1. BROW TESTING PRIOR TO ACCEPTANCE:

· EACH BROW SHALL BE STATIC LOAD TESTED.

LOADING SHALL BE TWO TIMES THE LOADS

DENOTED IN GENERAL NOTE 5 EVENLY DISTRIBUTED OVER THE AREAS WITH THE BROW SUPPORTED AT EACH END UNDER THE FEET.

· ONCE THE LOAD IS FULLY APPLIED, THE TEST

WEIGHT SHALL REMAIN ON THE BROW FOR A MINIMUM OF 10 MINUTES.

· DEFLECTION AT CENTER OF SPAN SHALL NOT EXCEED L/120 OF SPAN.

· THERE SHALL BE NO PERMANENT SET OF ANY MEMBER AFTER REMOVAL OF TEST WEIGHTS.

13.2. LIFTING POINTS TESTING PRIOR TO ACCEPTANCE:

· SHALL BE TESTED BY EVENLY LOADING EACH BROW WITH TWO TIMES THE LOADS DENOTED IN

GENERAL NOTE 5 MINUS THE WALKING DECK LOAD.

· THE BROW SHALL BE LIFTED BY THE LIFT POINTS

AND SUPPORTED FOR A MINIMUM OF 10 MINUTES.

13.3. CONTRACTOR SHALL PROVIDE TEST

DOCUMENTATION RESULTS TO PSNS.

14. MARKING REQUIREMENTS

14.1. THE COMPLETED BROW SHALL BE SCALE WEIGHED

WITH SIDE TRAYS AND SERVICE HANGERS INSTALLED.

14.2. DATA/TEST PLATE SHALL BE STAMPED/ETCHED WITH

BROW LENGTH AND BROW WEIGHT (TAKEN USING

DIRECTION IN GENERAL NOTE 13.1). PLATE SHALL BE AFFIXED VIA ADHESIVE ON THE OUTSIDE OF PC 28/29

GENERAL NOTES

TOWARDS ONE END OF THE BROW IN AN EASILY READABLE LOCATION.

14.3. AT BOTH ENDS, EACH SERVICE TUNNEL, ON PC 2,

SHALL BE MARKED WITH 2” LETTERING “WLL: 60 POUNDS PER LINEAR FOOT EVENLY DISTRIBUTED”.

14.4. AT BOTH ENDS, EACH SERVICE SIDE TRAY, ON PC11,

SHALL BE MARKED WITH 2” LETTERING “WLL: 20

POUNDS PER LINEAR FOOT EVENLY DISTRIBUTED”

· “BROW WT: XXXXX LBS”

· “MAX TEMP SERVICES WT: XXXXX LBS”

· “BROW MAY BE LIFTED FULLY LOADED WITH TEMP SERVICE LINES ONLY ”

· “SLING ANGLE SHALL BE 60° FROM HORIZ. OR BETTER”

· BROW WEIGHT SHALL BE MEASURED AFTER MANUFACTURING

· MAX TEMP SERVICE WEIGHT SHALL BE THE BROW LENGTH MULTIPLIED BY 200 (E.G. 70’ BROW WILL HAVE A MAX TEMP SERVICE WEIGHT:

70*200=14,000 LBS)

15. FOR TECHNICAL QUESTIONS OR COMMENTS, CONTACT

CODE 380.2 STRUCTURAL ENGINEER MATTHEW GREEN

BY PHONE AT 360-627-4785, OR BY EMAIL AT

MATTHEW.E.GREEN@NAVY.MIL OR CODE 380.2

STRUCTURAL ENGINEER ROBERT CRONE BY PHONE AT

360-627-4776, OR BY EMAIL AT ROBERT.CRONE@NAVY.MIL.

B

QTY

50'

QTY

70'

QTY

MATERIAL LISTSB

QTY

50'

QTY

70'

QTY

MCMASTER-CARR PART #91013A733 OR EQ

SECURE SIDE TRAY BRACKET

SECURE SERVICE TREE TO SERVICE TREE BRACE

B

QTY

50'

QTY

70'

QTY

MATCH TO PC 50 SECURE END STAIR

B B

QTY

50'

QTY

70'

QTY

LF

LF

FLOOR CLOSED VIEW OF THE BROW FLOOR OPEN VIEW OF THE BROW

EXPLODED VIEW OF THE BROW PLAN VIEWO

1/16" 1/2"

THRU HOLE

FOR PC 38

ENDS OF LOWER CHORD DETAIL J TYP 4 PLACES ON BROWB

ELEVATION VIEW CENTER DIAGONALS

ON GUSSET PLATES

TRUSS DESIGN, MEASUREMENTS APPLICABLE TO 30', 40', 50' LENGTHS

PLAN VIEW

ENDS OF LOWER CHORD TYP 4 PLACES ON BROW

ELEVATION VIEW CENTER DIAGONALS

ON GUSSET PLATES

TRUSS DESIGN, MEASUREMENTS APPLICABLE TO 60', 70' LENGTHS RESERVED FOR TRUSS DESIGN OF 25', 35', 45', 55' BROWS RESERVED FOR TRUSS DESIGN OF 65' BROWS PLAN VIEW16 R 14" 3/4" 3/4"

ELEVATION VIEW

ELEVATION VIEW PLAN VIEW ELEVATION VIEW TRUSS PIECES 1/2"

/2" 3/4"

DETAIL C

70' SHOWN IN EXAMPLE

LIFT POINT DETAILS

SEE GEN NOTE 11 FOR DETAILS

TYP

TYP

ELEVATION VIEW

SEE GEN NOTE 6.4 PERTAINING TO PC SPLICING

TRUSS DESIGN, WELDS APPLICABLE TO 30', 40', 50' LENGTHS

TYP

TYP

ELEVATION VIEW

SEE GEN NOTE 6.4 PERTAINING TO PC SPLICING

TRUSS DESIGN, WELDS

APPLICABLE TO 60', 70' LENGTHS RESERVED FOR TRUSS DESIGN OF 35', 45', 55' BROWS RESERVED FOR TRUSS DESIGN OF 65' BROWS

IF INTERFERENCE EXISTS,

PC 19 MAY BE ALTERED TOB

ACCOMODATE FOR INTERFERENCE.

MTL REMOVED SHALL BE MINIMIZED

SIDE VIEW ELEVATION VIEW

DECK DESIGN, MEASUREMENTS

/4" 1/2" 1/2"

TYP

TYP

PLAN VIEW

END EDGE DECK DESIGN PC 21 AND PC 33 NOT SHOWN FOR CLARITY

ELEVATION VIEW

DECK DESIGN, WELD

OVERALL DESIGN

SEE GEN NOTE 7

ELEVATION VIEW TEMP SERVICE SIDE TRAY DESIGN

TEMP SERVICE SIDE TRAY SUPPORT DESIGN

B /4" 1/4"

TEMP SERVICE SIDE TRAY SUPPORT DESIGN

MODIFIED MOUNTING BRACKET LAYOUT APPLICABLE TO 30' - 50' LENGTHS

REV. B

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PLAN VIEW 4

COPE JOINT TO

SUIT PC 11

ELEVATION VIEW ELEVATION VIEW

O

/2" TYP

1/2" 1/2"

SIDE VIEW

ELEVATION VIEW

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SERVICE TREE DESIGN B

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ELEVATION VIEW

ELEVATION VIEW

OVERALL STAIR ASSEMBLY12

O /2"

VARIOUS PCS NOT SHOWN FOR CLARITY

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STAIR ASSEMBLY PCS DESIGN B

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M-1438

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ELEVATION VIEW

PC 55 NOT SHOWN FOR CLARITY

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STAIR ASSEMBLY WELD DESIGN 29 OF 29B

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